Headlight warning signal for vehicles



FIG. 1 is a perspective view of a headlight warning signal for vehicles showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, with the opposite side being a mirror image; and,

FIG. 5 is a top plan view thereof, with the bottom being a mirror image. 

The ornamental design for a headlight warning signal for vehicles, as shown and described. 